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Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Spintronics (incl. quantum dynamics) (Joint session of HL, MA and TT, organized by MA)

HL 52.4: Talk

Wednesday, March 9, 2016, 10:15–10:30, H32

Optically and thermally driven spin dynamics and quantum Otto cycles on Ni4 structures — •Stefan Sold1, Bhaskar Kamble2, Georgios Lefkidis1, and Wolfgang Hübner11Departement of physics, University of Kaiserslautern and Research Center OPTIMAS, Germany — 2Asia Pacific Center for Theoretical Physics, Pohang, Korea

We present two different kinds of combined optical and thermodynamic processes on the chain-like prototypical Ni4 cluster, described on the basis of high-level quantum chemistry. The one consists of incoherent spin relaxation and thermalization processes, the other one of a nano Otto engine.

First, we model various temperature profiles by coupling to one or two temperature baths. The system dynamics is mathematically described with the Lindblad superoperator [1]. We find that the inhomogeneous temperature profile, giving rise to non-equilibrium mixed states, induces non-uniform spin-density distribution (spin Seebeck effect on the nano scale).

Second, we propose a quantum Otto motor [2], which benefits from the spin degree of freedom and the energy discretization of the cluster, and may thus surpass the efficiency limit of classical Carnot cycles [3].

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